actioncontext

前面已经了解到ActionContext是Action执行时的上下文，里面存放着Action在执行时需要用到的对象，我们也称之为广义值栈。 Struts2在每次执行Action之前都会创建新的ActionContext，在同一个线程里ActionContext里面的属性是唯一的，这样Action就可以在多线程中使用。 1 ：ActionContext 的线程安全性 那么Struts2是如何保证ActionContext的线程安全性呢？ 看看ActionContext对象的代码，示例如下： public class ActionContext implements Serializable { static ThreadLocal actionContext = new ThreadLocal(); …… } ThreadLocal又称为“线程局部变量”，它为每一个使用该变量的线程都提供一个变量值的副本，使每一个线程都可以独立地改变自己的副本，而不会和其它线程的副本冲突。 存放在ActionContext里的数据都存放在这个ThreadLocal的属性中，而这个属性只会在对应的当前请求线程中可见，从而保证数据是线程安全的。 2 ：访问的是Map 回顾前面在使用ActionContext来访问Session中数据的程序，你会发现，其实在程序里面访问的是一个Map

上一篇文章概述了Struts2的一些流程。这次说下ActionContext，直接进入正题。 static ThreadLocal actionContext = new ThreadLocal();//ActionContext public static ActionContext getContext() { return (ActionContext) actionContext.get(); } 从上面可以看到ActionContext 是被存放在当前线程中的，获取 ActionContext 也是从 ThreadLocal 中获取的。因此在执行拦截器、 action 和 result 的过程中，由于他们都是在一个线程中按照顺序执行的，所以可以在任意时候从 ThreadLocal 中获取 ActionContext 。 ActionContext是Action执行时的上下文,上下文可以看作是一个容器 Map<String, Object> context; public static void setContext(ActionContext context) { actionContext.set(context); } public static ActionContext getContext() { return (ActionContext)

Can any one please describe me when the objects of ActionMapper , ActionProxy , ActionInvocation , ActionContext are created in a Struts2 application. As I am new to Struts2 framework, I am very much confused about the scopes of these objects. The ActionMapper is created on startup, it has a singleton scope. The ActionContext is created by the Dispatcher in preparing an action to execute, it's ThreadLocal , and it doesn't have any scope. When action is executing the ActionInvocation and ActionProxy are created that also don't have a scope. You can see this on a big picture of Struts2

I am working on Transaction Management application, and I am using Struts2. I have used internally a session for setting and getting values like ActionContext.getContext().getSession().put("string", string); Is there any limit or any disadvantage of using a session like this in the application? Limit is the size of your computers physical memory.you dont store dynamic values in session because someone can modify them in the meanwhile , so store only those values in session which represent any user specific data or static values (i.e. which are not going to be changed while session exists).

Problem: Struts ActionContext is null during test Using Struts2 JUnit plugin I have the following test: public class MainActionIT extends StrutsJUnit4TestCase { @Test public void testAction() { Map<String, Object> application = new HashMap<String, Object>(); application.put("options","home"); ActionContext.getContext().put("application",application); ActionProxy proxy = getActionProxy("/home"); String result = proxy.execute(); } } The two related classes are as follows: public class MainAction extends BaseAction { @Action(value = "/home", results = {@Result(name = "success", location = "home

My questions are: In Struts2, does every action object have its own corresponding ActionContext and ValueStack? In other words, for every new request a new action object is created. Does this mean every time a new action object is created, a new ActionContext and ValueStack also get created? Consider this scenario: Action1------1st req------->view.jsp------2nd req--------->action2. So when a request comes for action1 a new object of action1 and corresponding ActionContext and ValueStack will get created. From view.jsp (upon clicking hyperlink) a new request goes for action2. Does this mean

I am writing acceptance tests (testing the behavior) using cucumber-jvm, on an application with Struts 2 and Tomcat as my Servlet Container. At some point in my code, I need to fetch the user from the Struts 2 HttpSession , created by an HttpServletRequest . Since I'm doing tests and not running Tomcat, I don't have an active session and I get a NullPointerException . Here's the code I need to call: public final static getActiveUser() { return (User) getSession().getAttribute("ACTIVE_USER"); } And the getSession method: public final static HttpSession getSession() { final HttpServletRequest

I'm just upgrading to Struts 2.3.1.2, and having a few issues with JUnit tests. My old test code was like this.... public class HomeActionTest { @Test public void testUserNameErrorMessage() throws Exception { HomeAction action = new HomeAction(); setupMocks(action); action.execute(); } } The action class's execute method has the code String text = getText(GLOBAL_SELECT); This causes a NullPointerExeception though in LocalizedTextUtil since it calls... ActionContext.getContext() Now I could try and do this... ActionContext.setContext(new ActionContext(new HashMap())); But then I'll get a

In any case id get exception Could not parse date . There is unified company standard of date format - 'dd/MM/yyyy' There are computers with different system locales. I am using jQueryUI for datepicker ( it is standard for widgets and already settled css styles to match application theme). At the beginning, i didn't found better solution then manually convert date string to date object using SimpleDateFormat object. Now i have converter class but still need to configure every Action that has java.util.Date property. I am using XML configuration and I did try to add into struts.xml : <constant